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853 results about "Carbon coating" patented technology

Lithium ion battery silicon-based composite anode material, preparation method thereof and battery

The invention relates to a lithium ion battery silicon-based composite anode material, a preparation method of the lithium ion battery silicon-based composite anode material, and a battery. The lithium ion battery silicon-based composite anode material adopts an embedded composite core-shell structure, a core has a structure formed by embedding nano silicon particles into a gap of an inner layer of hollowed graphite, and a shell is made from a non-graphite carbon material. According to the silicon-based composite anode material, mechanical grinding, mechanical fusing, isotropic compression processing and carbon coating technologies are combined, so that the nano silicon particles can be successfully embedded into the inner layer of the graphite and the surfaces of graphite particles are uniformly coated; the high-performance silicon-based composite anode material is obtained and is excellent in cycle performance (the 300-times cycle capacity retention ratio is more than 90%) and high in first efficiency (more than 90%); in addition, the silicon-based composite anode material is high in specific energy and compaction density, and can meet the requirements of a high-power density lithium ion battery; the preparation process is simple, the raw material cost is low, and the environment is protected.
Owner:BTR NEW MATERIAL GRP CO LTD

Preparation method of monodisperse lithium iron phosphate nanometer material and lithium-ion secondary battery

The invention relates to a preparation method of a monodisperse lithium iron phosphate nanometer material, which is characterized by comprising the following steps of: dissolving a soluble lithium source compound, a ferrous source compound, a phosphorus source compound, a dopping element compound, a carbon source compound, and the like into water or a mixed solvent of the water and an organic solvent; sequentially adding to the organic solvent for stirring and mixing according to specific material mole ratio and order, and keeping the volume ratio of the organic solvent to the water to be within a certain range; transferring a mixture to a high-pressure reaction still for heating treatment; and processing a product through a plurality of steps of washing, drying, carbon coating, ball-milling, mixing, annealing, and the like to obtain the lithium iron phosphate anode active material which has high multiplying power circulation and property. The invention also discloses a relevant lithium-ion secondary battery. By adopting a hydrothermal/solvothermal method and using soluble materials as reactants, the invention enables ions to be uniformly mixed in the synthesizing process, thereby obtaining better crystal forms and very pure phases and further enhancing the property of batteries.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

SiOx based composite negative electrode material, preparation method and battery

The invention relates to a high-capacity SiOx based composite negative electrode material, a preparation method and a battery, wherein the negative electrode material comprises a silicon oxide material, a carbon material and an amorphous carbon coating layer; the silicon oxide material is silicon oxide or silicon oxide material modified in a carbon coating manner; surfaces of carbon material particles are coated with the silicon oxide material. A preparation method of the high-capacity SiOx based composite negative electrode material comprises the steps of performing physical processing or carbon coating modification on a silicon oxide raw material, thus obtaining a micron-sized silicon oxide material; and then mechanically fusing, coating with a solid phase and sintering at a high temperature to obtain the high-capacity negative electrode material. Through the high-capacity SiOx based composite negative electrode material, the effect of uniform dispersing and coating of the micron-sized silicon oxide particles on the surfaces of the carbon material particles can be achieved by virtue of the combination of mechanical fusion and solid-phase coating processes. The silicon oxide particles are well dispersed on the surface of the carbon material particle; the strength of bonding between the silicon oxide particles and the carbon material particles is high; the recycling performance of the material can be greatly improved; and meanwhile, the high-capacity SiOx based composite negative electrode material is high in first efficiency (breaking through the theoretical efficiency of SiOx), low in expansion rate, long in service life, environmental-friendly, pollution-free and low in cost.
Owner:BTR NEW MATERIAL GRP CO LTD

Sodium-titanium phosphate/carbon composite material and preparation method and use thereof

The invention belongs to the field of electrode material synthesis, and relates to a sodium-titanium phosphate/carbon composite material and a preparation method and use thereof. The sodium-titanium phosphate/carbon composite material comprises secondary particles formed by clustering primary particles, the primary particles comprise sodium-titanium phosphate particles and carbon layers coated on the surfaces of the sodium-titanium phosphate particles, and the carbon layers are prepared through two times of carbon coating. According to the sodium-titanium phosphate/carbon composite material and the preparation method and use thereof, by means of preparing a precursor of the sodium-titanium phosphate and then adopting a spray drying method to carry out primary carbon coating and secondary carbon coating, the sodium-titanium phosphate/carbon composite material having a uniform and compact coating carbon layer is prepared, and the problem that the coating carbon layer obtained by the primary carbon coating is not uniform is solved. The composite material is good in stability, electrodes prepared from the sodium-titanium phosphate/carbon composite material and assembled batteries have excellent electrochemical properties, the discharge capacity is above 115mAh/g, and the capacity retention ratio is above 95% after 500 weeks of circulation.
Owner:SHENZHEN CITY BATTERY NANOMETER TECH

Carbon-metal oxide composite coated lithium battery ternary positive electrode material and preparation method thereof, and lithium battery

The invention provides a carbon-metal oxide composite coated lithium battery ternary positive electrode material and a preparation method thereof, and a lithium battery. The carbon-metal oxide composite coated lithium battery ternary positive electrode material comprises a ternary positive electrode material matrix and a composite coating material, wherein the composite coating material comprisesa carbon-metal oxide complex. According to the present invention, the composite coating material contains the carbon-metal oxide complex, such that the advantages of the carbon coating and the metal oxide are integrated, wherein the carbon coating can effectively improve the electronic conductivity and the ion diffusion coefficient of the material, reduce the agglomeration, effectively prevent theelectrolyte from eroding on the positive electrode material, stabilize the structure of the material, and improve the electronic conductivity, the rate performance and the cycle performance of the material so as to ensure the rapid transmission of the Li<+> on the material surface and the electrochemical activity, and the amorphous metal oxide coating can reduce the side reaction between the electrode material and the electrolyte and improve the ionic conductivity so as to maximize the comprehensive performance.
Owner:桑德新能源技术开发有限公司 +1

Carbon-coated nickel-cobalt lithium manganate positive electrode material and preparation method thereof

The embodiment of the invention discloses a preparation method of a carbon-coated nickel-cobalt lithium manganate positive electrode material, and belongs to the technical field of preparation of a lithium battery positive electrode material. The preparation method comprises the following steps: adding a chelating agent and a carbon source into a solution containing lithium salt, nickel salt, cobalt salt and manganese salt, and performing high-temperature spray pyrolysis to obtain precursor powder; compacting the precursor powder by vibration or pressure, wherein the compaction density by the vibration or the pressure is 0.3-3.2g/cm<3> so that lithium ions, nickel ions, cobalt ions and manganese ions are uniformly dispersed in the powder and are contacted closely; and calcining the precursor powder, and cooling to obtain the carbon-coated nickel-cobalt lithium manganate positive electrode material with the good conductivity and the high cyclic stability. The carbon-coated nickel-cobalt lithium manganate positive electrode material comprises nickel-cobalt lithium manganate and carbon coating the surface of nickel-cobalt lithium manganate. The method disclosed by the embodiment of the invention is easy to operate and easy to control and facilitates the large-scale industrial production.
Owner:CHERY AUTOMOBILE CO LTD
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